After an episode of forest fire, the first type of organism likely to be found living in the center of the burned area would be grasses.
It is the gradual change to the community of plants and animals in an ecosystem until a stable community is reached.
Succession can be primary or secondary. Primary succession happens on newly colonized bare grounds of stones while secondary succession happens in an existing community after a period of disturbance such as wildfire.
A forest ravaged by fire will have all the animals dead or away for safety reasons. These animals may not come back until regrowth has reached a certain level.
However, propagules of grasses are often fire-resistant and even get stimulated by fire in most cases. Thus, the first type of organism to be found living in the burned area could be grasses.
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